module ap.activity_stream;

import std.json;

import util;

/++ 
 * Basic ActivityStream Object
 * https://www.w3.org/TR/activitypub/#obj
 +/
class ASObject {
  // Required fields (for root objects)
  string context; /// Must be activitystream context
  string id; /// AP requirement for unique identifier
  string type; /// AP requirement for type of object

  // Optional fields

  JSONValue raw;

  /++ 
   + Constructs the object according to json source
   + Params:
   +   json = the source json
   + Returns: Object
   +/
  this(JSONValue json) {
    with (this) {
      const(JSONValue)* ascontext = "@context" in json;

      if (ascontext) {
        switch ((*ascontext).type) {
        case JSONType.ARRAY:
          context = (*ascontext)[0].str;
          break;

        case JSONType.STRING:
          context = (*ascontext).str;
          break;

        default:
          throw new Exception("Invalid @context type for ActivityStream Object");
        }
      }

      optional(json, "id", id);
      optional(json, "type", type);

      raw = json;
    }
  }
}